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Denial of service in Qt

Published: 2019-11-02
Severity Low
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2019-18281
Exploitation vector Network
Public exploit N/A
Vulnerable software
Universal components / Libraries / Scripting languages

Vendor Trolltech

Security Advisory

This security advisory describes one low risk vulnerability.

1) Out-of-bounds read

Severity: Low

CVSSv3: 3.8 [CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-18281

CWE-ID: CWE-125 - Out-of-bounds Read

Exploit availability: No


The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a boundary condition within the generateDirectionalRuns() function in qtextengine.cpp in Qt qtbase. A remote attacker can create a specially crafted file, containing many directional characters, trick the victim into opening it, trigger out-of-bounds read error and crash the affected application.


Install updates from vendor's website.

Vulnerable software versions

Qt: 5.11.0, 5.11.1, 5.11.2, 5.11.3, 5.12.0, 5.12.1, 5.12.2, 5.12.3, 5.12.4

CPE External links

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.